A reader who asks his name not be used writes about the drug raid video from Columbia, Missouri: I am a US Army officer, currently serving in Afghanistan. My first thought on reading this story is this: Most American police SWAT teams probably have fewer restrictions on conducting forced entry raids than do US forces in Afghanistan. ... Generally, our troops, including the special ops guys, use what we call "cordon and knock": they set up a perimeter around the target location to keep people from moving in or out,and then announce their presence and give the target an opportunity...